At OMG meeting on Dec. 12, 2014, we presented astah GSN. We have been developing a new GSN(Goal Structuring Notation) tool on top of our UML/SysML tool "Astah" to covert both system's Design Model(as UML/SysML) and Assurance Case Model(as GSN) together. In this session, we will demonstrate and explain how we have integrated the two models in the same user interface.